JP4537917B2 - Sedimentation basin equipment - Google Patents

Description

  The present invention relates to a sedimentation basin facility used in a water purification plant, and in particular, uniforms the flow rate of water flowing into a sloping plate or a sloping pipe sedimentation device disposed in the sedimentation basin of the sedimentation basin facility, thereby carrying over the flock in the sedimentation basin. The present invention relates to a sedimentation basin facility that is designed to prevent the above.

Conventionally, as shown in FIG. 1, this type of sedimentation basin equipment has an inclined plate or inclined pipe settling device 101 disposed in the settling basin 100, and a water collection trough 102 and a lower portion are disposed above the inclined plate or inclined tube settling device 101. An inflow chamber 103 into which water (turbid water) flows is arranged. A rectifying wall 104 is disposed on the side of the settling basin 100, and the water W is rectified and flows through the rectifying wall 104. The water flowing into the inflow chamber 103 flows into the lower end inflow portion of the inclined plate or inclined pipe settling device 101. In the inclined plate or inclined tube settling device 101, the incoming water is separated into solid and liquid, and the water rises and flows into the water collecting trough 102. Sludge in the running water is separated in the inclined plate or inclined tube settling device 101, slides down the inclined surface, sinks the inflow chamber 103, and accumulates at the bottom of the inflow chamber 103. The accumulated flocs, that is, sludge, are raked up by the sludge scraper 108 and collected in the sludge pit 105. By opening the mud valve 106, the sludge in the mud pit 105 is discharged out of the sedimentation basin 100. In addition, 107 of FIG. 1 is a drive device which drives the sludge scraper 108.
Water Supply Facility Design Guidelines 2000, 197 pages, issued on March 31, 2000 Japan Water Works Association

  As shown in FIG. 2, the water W flows into the inflow chamber 103 as rectified water w having a uniform flow rate through the rectifying wall 104, but the water flowing into the settling basin 100 in the inclined plate or inclined pipe settling device 101. The turbidity density flow due to the high turbidity of W and the temperature density flow due to the water temperature difference in the sedimentation basin 100 cause the water flow rate in the inclined plate or inclined tube settling device 101 to be non-uniform (for example, the flow rate in part A in FIG. The floc in the sedimentation basin 100 may carry over and flow out to a subsequent filtration basin (not shown).

The present invention has been made in view of the above points. The flow rate of water flowing into the inclined plate or inclined tube settling device is made uniform to prevent turbidity density and temperature density flow, and the floc key in the settling basin is prevented. An object is to provide a sedimentation basin facility that can prevent a overflow.

In order to solve the above-mentioned problem, the invention according to claim 1 is arranged such that an inclined plate or an inclined pipe settling device is disposed in a settling basin, and a water collecting trough is introduced into the upper portion of the inclined plate or the inclined tube settling device, and water flows into the lower portion. with placing the chamber, provided with a sludge discharge mechanism for discharging the sludge deposited on the flow entry bottom, water that has flowed into the flow entry is through the inclined swash plate or inclined tube settler to flow out to the water collecting trough in the configuration the sedimentation tank facilities, provided a rectifying waste sludge device for discharging the inclined plate or inclined tube settler rectifies and sludge water flowing into below the inclined swash plate or inclined tube settler of inflows chamber, rectifier The mud draining device includes a number of rectifying and draining cells arranged adjacent to each other in a planar shape, and each rectifying and draining cell has a polygonal cross-sectional shape and the same cross-sectional shape from the upper end to a predetermined position below. And the same cross-sectional area, the cross-section below the predetermined position Is configured in cross section gradually reduced, the inlet of the lower end opening is water, the upper end opening, characterized in that it is and the outlet of water.

The invention according to claim 2, in sedimentation tank installation according to claim 1, inclined swash plate or inclined tube settler is mounted installed to the frame placed in the vertical direction by a predetermined position of the precipitation sediment pond, rectification desludging device is characterized in that its upper end is mounted so as to be positioned below the inclined swash plate or inclined settler to rack mount.

Invention according to claim 3, in the invention described in claim 1, integer Nagarehai mud device, that is provided integrally with its upper end connected to the lower end of the inclined swash plate or inclined tube settler Features.

According to the first aspect of the present invention, each rectifying and drainage cell has a polygonal cross-sectional shape, the same cross-sectional area from the upper end to the lower predetermined position, and the same cross-sectional area. The lower part is configured so that its cross section gradually shrinks, the lower end opening is the water inlet, and the upper end opening is the water outlet. jet water flowing into the inlet passes through a portion where the sectional area gradually increases, the uniform flow rate while the cross-sectional shape and cross-sectional area passes through the same portion, inclined swash plate or inlet of the oblique tube settler bottom The flow rate of water flowing into the basin can be made uniform, and turbidity density flow and temperature density flow can be prevented to provide a sedimentation basin facility capable of preventing carryover of flocs in the sedimentation basin. Moreover, it is preferable that the plane cross-sectional shape of each rectification | suction drainage cell of a rectification | straining sludge apparatus is a regular polygon, and it is more preferable that it is a rectangular shape or a regular hexagon. By adopting a rectangular (square) or regular hexagonal shape, it is easy to install the rectification / drainage cell in the sedimentation facility, and the flow rate of the inflowing water is more easily made uniform.

According to the second aspect of the present invention, the rectifying and draining device is attached to the mount on which the inclined plate or the inclined tube settling device is mounted so as to be positioned below the inclined plate or the inclined tube settling device. The existing sedimentation basin equipment in which the plate or the inclined pipe sedimentation device is mounted on the mount can be easily modified to the sedimentation basin equipment according to the present invention.

According to the third aspect of the present invention, since the rectifying and draining device is integrally connected to the lower end of the inclined plate or the inclined tube settling device, the rectifying and discharging device and the inclined plate or the inclined tube are provided. Since the settling device is integrated, it is easy to install the settling basin equipment in the settling basin.

    Embodiments of the present invention will be described below with reference to the drawings. 3 and 4 are views showing the main part of the settling basin of the settling basin equipment according to the present invention, FIG. 3 is a sectional side view showing the main part of the settling basin, and FIG. It is. An inclined plate or inclined pipe settling device 11 is arranged in the sedimentation basin 10, a water collecting trough 12 is arranged at the upper part of the inclined plate or inclined pipe settling device 11, and an inflow chamber 13 into which water (turbid water) flows is arranged at the lower part. The point is the same as the sedimentation basin equipment of FIG. Here, a rectifying and draining device 14 that rectifies water flowing into the inclined plate or inclined pipe settling device 11 and discharges sludge is provided below the inclined plate or inclined pipe settling device 11 in the inflow chamber 13. The flow straightening wall, the sludge scraper, the waste pit, etc. are substantially the same as those in FIG.

The rectification / drainage device 14 includes a number of rectification / drainage cells 15 arranged in a plane adjacent to each other, and each of the rectification / drainage cells 15 has a rectangular cross section (square shape) as shown in FIGS. ) From the upper end to a predetermined position below (from the upper end to the lower dimension L _4-1 ), the flat cross section is the same rectangular shape and the cross sectional area is also the same. From the predetermined position to the lower end (from the lower end of dimension L _4-1 to dimension L _4-2 ), the cross section is configured to be a contracted portion (inclined portion 15c) that gradually contracts, and the inner surface forms an inclined surface. . That is, each rectification / drainage cell 15 has a rectangular cross section and the same cross-sectional area from the predetermined position to the predetermined position, and a rectangular cross section from the predetermined position to the lower end and the cross-sectional area gradually contracts. Yes. And the lower end of the rectification mud cell 15 opens and becomes the inflow port 15a of water, and the upper end opens similarly and becomes the outflow port 15b of water. Here, in order to attenuate the jet of water flowing in from the inflow port 15a, the opening area ratio (inlet 15a with respect to the outflow port 15b) is set to about 5% to 10%, or inflow to the inflow port 15a. It is preferable to set the speed to about 500 mm / min to 200 mm / min.

Each rectification mud cell 15 is formed of a resin material, for example. A plurality of rectifying mud cells 15 are bound with suspension wires 16 and hung on a gantry 17 on which an inclined plate or inclined pipe settling device 11 is installed. It attaches so that the outflow port 15b of the upper end opening of the mud cell 15 may be located below the inclined plate or inclined tube settling device 11. Thereby, it becomes easy to arrange the rectifying and draining device 14 in the inflow chamber 13 of the settling basin 10 of the existing settling basin equipment. That is, it becomes easy to remodel the sedimentation basin equipment of the structure in which the existing inclined plate or the inclined pipe sedimentation apparatus 11 is installed on the mount 17 to the sedimentation basin equipment according to the present invention. In addition, the dimension L ₁ from the upper end of the inclined plate or inclined pipe settling device 11 to the water collecting trough 12, the thickness dimension L _{2 of} the inclined plate or inclined pipe settling device 11, the rectified waste mud from the lower end of the inclined plate or inclined pipe settling device 11 The dimension L ₃ up to the upper end of the apparatus 14 and the thickness dimension L ₄ of the rectifying and draining apparatus 14 can be arbitrarily set in consideration of uniform flow velocity, floc separation, sedimentation efficiency, etc. Here, L ₁ = 600 mm L ₂ = 800 mm, L ₃ = 300 mm, and L ₄ = 500 mm.

As shown in FIG. 6, in the rectification / drainage device 14 composed of a large number of rectification / drainage cells 15 arranged in a plane adjacent to each other as described above, an inflow is made from the inlet 15 a of each rectification / drainage cell 15. The water w that flows is flowing upward. Then, the flow velocity is made uniform at the cross-section expanded portion where the cross-sectional area is increased, and flows into the inclined plate or inclined pipe settling device 11. The flock (sludge) f that flows in with the inflowing water settles in the rectification / drainage cell 15, accumulates in the lower inclined portion 15c, and gradually falls. In addition, flocs falling from the inclined plate or inclined tube settling device 11 settle in the rectifying / drainage cell 15 and settle on the lower inclined portion 15c and gradually fall. The inclination angle θ of the lower inclined portion 15c is an angle close to the repose angle, that is, 50 ° to 70 °, preferably 55 ° to 65 °, more preferably 60 °. Moreover, the height width dimension of the rectification mud discharge cell 15 is set to the distance required for the jet of water flowing in from the inflow port (lower end opening) 15a to attenuate. Here, the height dimension L ₄ = 500 mm, the height dimension L _4-1 = 200 mm of the cross-section expansion part, the height dimension width dimension L _4-2 = 300 mm of the cross-section contraction part, and the width of the outlet (upper end opening) 15b The dimension L ₅ = 500 mm and the width dimension L _{6 of} the inflow port (lower end opening) 15 a was set to 150 mm.

  In the above example, the straightening / mudging device 14 is manufactured separately from the inclined plate or the inclined pipe settling device 11, and the straightening / mudging device 14 composed of a plurality of straightening / mudging cells 15 is inclined by the suspension wire 16. Although the example which suspended and attached to the mount 17 which has installed the board or the inclined pipe sedimentation apparatus 11 was shown, it is not limited to this, For example, as shown in FIG. The inclined pipe settling device 11 may be manufactured integrally and installed in a settling basin. As a result, the inclined plate or inclined pipe settling device 11 and the rectifying and draining device 14 are integrated, so that it is easy to install in the settling basin.

  Further, the shape of the rectification / drainage cell 15 is not limited to a rectangular rectangular cross section. For example, as shown in FIGS. Is formed, and the rectified waste mud cell 15 having the lower end opening as the inflow port 15a and the upper end opening as the outflow port 15b is used. As shown in (corresponding to the B cross section), the rectifying and discharging apparatus 14 may be configured by arranging a large number of them adjacent to each other in a plane.

    Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible.

It is a figure which shows the structural example of the conventional sedimentation basin equipment. It is a figure which shows the flow state of the water of the conventional sedimentation basin equipment. It is a figure which shows the principal part structural example of the sedimentation basin equipment which concerns on this invention. It is BB sectional drawing of FIG. It is a figure which shows a part of sedimentation tank installation which concerns on this invention. It is a figure for demonstrating the motion of the water of the rectification | suction mud cell of the rectification / sludge apparatus of the sedimentation basin equipment which concerns on this invention, and a flock. It is a figure which shows the structural example of the inclined plate of the sedimentation basin equipment which concerns on this invention, or an inclined pipe sedimentation apparatus, and a rectification | straightening sludge apparatus. It is a figure which shows the structural example of the rectification | suction mud cell of the rectification / sludge apparatus of the sedimentation basin equipment which concerns on this invention. It is a figure which shows the example of a plane structure of the rectification | suction drainage apparatus of the sedimentation basin equipment concerning this invention.

Explanation of symbols

10 Sedimentation basin 11 Inclined plate or inclined tube settling device
12 Catchment trough
13 Inflow chamber
14 Rectification drainage device 15 Rectification drainage cell 16 Suspension wire 17 Mount

Claims (3)

An inclined plate or inclined pipe settling device is arranged in the settling basin, a water collection trough is arranged at the upper part of the inclined plate or inclined pipe settling device, an inflow chamber into which water flows in is arranged at the lower part, and the sludge accumulated at the bottom of the inflow chamber is disposed. In a sedimentation basin facility comprising a sludge discharge mechanism for discharging, and configured such that water flowing into the inflow chamber flows out to the water collection trough through the inclined plate or the inclined pipe settling device,
A rectifying and draining device for rectifying water flowing into the inclined plate or inclined pipe settling device and discharging sludge is provided below the inclined plate or inclined pipe settling device in the inflow chamber ,
The rectifying and draining device includes a large number of rectifying and discharging cells arranged adjacent to each other in a plane,
Each of the rectifying and drainage cells has a polygonal cross-sectional shape, the same cross-sectional area from the upper end to a predetermined position below the upper end, and the same cross-sectional area. A sedimentation basin facility characterized in that the lower end opening is a water inlet and the upper end opening is a water outlet . In the settling pond facility according to claim 1 ,
The inclined plate or the inclined pipe settling device is mounted on a base installed at a predetermined position in the vertical direction of the settling pond,
The rectifying and drainage device is attached to the gantry so that its upper end is positioned below the inclined plate or inclined settling device. In the settling pond facility according to claim 1 ,
The rectifier waste sludge system, sedimentation basin equipment, characterized in that the upper end is linked integrally provided on the lower end of the front Ki傾 swash plate or inclined tube settler.

Images